[w3c/manifest] BREAKING CHANGE: Replace "badge" with "monochrome" (#833)

Closes #830

This change (choose one):

* [x] Breaks existing normative behavior (please add label "breaking")
* [ ] Adds new normative requirements
* [x] Adds new normative recommendations or optional items
* [ ] Makes only editorial changes (only changes informative sections, or
  changes normative sections without changing behavior)
* [ ] Is a "chore" (metadata, formatting, fixing warnings, etc).

Implementation commitment (delete if not making normative changes):

* [ ] Safari (link to issue)
* [ ] Chrome (link to issue)
* [x] Firefox (https://bugzilla.mozilla.org/show_bug.cgi?id=1602126)
* [ ] Edge (no public signal)

Commit message:

Following discussion in #830, renaming `purpose: "badge"` to `purpose: "monochrome"` and expanding on the definition.

You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/manifest/pull/833

-- Commit Summary --

  * BREAKING CHANGE: Replace "badge" with "monochrome"

-- File Changes --

    A images/monochrome-icon-gray.svg (12)
    A images/monochrome-icon-plain.svg (12)
    A images/monochrome-icon-tinted.svg (5)
    M index.html (113)

-- Patch Links --

https://github.com/w3c/manifest/pull/833.patch
https://github.com/w3c/manifest/pull/833.diff

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